Synthesis of hexagonal Y type zeolites in the presence of Gd(III) complexes of 18-crown-6

被引：15
作者：
Balkus, KJ
Shi, JM
机构：
[1] Department of Chemistry, University of Texas at Dallas, Richardson
来源：
MICROPOROUS MATERIALS | 1997年 / 11卷 / 5-6期
关键词：
zeolite synthesis; 18-crown-6; template; hexagonal Y; gadolinium; MRI contrast agents;
D O I：
10.1016/S0927-6513(97)00054-0
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Zeolite hexagonal Y was successfully synthesized in the presence of both 18-crown-6 and the Gd(III) complexes of 18-crown-6 as templates. The crystallization times as well as the gadolinium content in the hexagonal Y were found to increase with increasing ratios of Gd3+-18-crown-6/SiO2 in the initial gel compositions. The resulting hexagonal Y zeolites were characterized by XRD, FT-IR and SEM. Partial evidence for the template role and encapsulation of Gd3+-18-crown-6 are described. The room temperature proton relaxivities of aqueous suspensions of hexagonal Y entrapped Gd3+-18-crown-6 were measured. The pH stability of the hexagonal Y samples was also determined. Based on these results the potential application of hexagonal Y synthesized with Gd3+-18-crown-6 as oral MRI contrast agent is discussed. (C) 1997 Elsevier Science B.V.
引用
收藏
页码：325 / 333
页数：9
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